Resumo

MURER, M. et al. Fluctuation-induced conductivity of polycrystalline Gd_1-χCe_χBa₂Cu₃O_7-δ superconductor. Rev. mex. fis. [online]. 2012, vol.58, n.5, pp.404-410. ISSN 0035-001X.

This paper reports on measurements of the resistive transition in polycrystalline Gd_1-χ Ce_χ Ba₂ Cu₃ O_7-δ samples (x = 0.000, 0.025 and 0.050). The samples were produced by a standard solid state reaction method and in two different thermal routes. The microstructure was analyzed by X-ray diffraction. The samples were considered homogeneous since no extra peaks due to impurity phase were observed. To identify power-law divergences in conductivity, the results were analyzed in terms of the temperature derivative of the resistivity and the logarithmic temperature derivative of the conductivity (d ln (Δσ) /dT). From the results, the occurrence of a two-stage transition besides the pairing transition splitting for sample with x = 0.050 was observed. Such splitting was associated with Ce doping and related with the occurrence of a phase separation. In the normal phase, Gaussian and critical fluctuations conductivity regimes were identified. Ón approaching the zero resistance state, our results showed a power-law behavior that corresponds to a phase transition from a paracoherent to a coherent state of the granular array.

Palavras-chave : High-T_C superconductor; polycrystalline; gadolinium; cerium; critical phenomena; fluctuation effects.

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